With the release of Fences 4, we are enforcing the EULA policy of 1 activation (PC) per license:
https://www.stardock.com/support/software-eula
With that, we have compiled a FAQ to cover predictable inquiries.
How does this affect the Fences 4 product in Object Desktop?
Fences 4 will still have 5 concurrent activations as do all the other member products.
If I have an expired Object Destktop license, will that qualify me for a discount for Fences 4?
No; however, every lapsed Object Desktop license can be renewed at a substantial discount - that renewed license will include Fences 4 (and all it's future updates while the Object Destkop license is activate) as well as all the other member apps that are included.
To renew your Object Desktop license, please visit your account page that it is under:
https://store.stardock.com/myaccount/products
If I had more than 1 concurrent activation with Fences 3, will that same count be included with an upgrade to Fences 4?
No, it will not, but discounts will be available forever for more licenses should you purchase them (explained below).
If I purchase Fences 4, can I get more licenses at a discount?
Yes, once you purchase Fences 4 (retail, not corp) you will be able to get additional licenses at a discount using the 'upgrade' link on the product page(s):

Do you provide greater discounts for higher quantities?
Fences now has a 5 pack option for activating multiple PCs on a single key.
https://www.stardock.com/products/fences4/download
There is no 'upgrade' pricing for the 5 pack as it is already heavily discounted.
As noted prior, if 5 is more than you need, one can purchase individual licenses at a perpetual discount if you already have a qualifying product (Fences 4 is, of course, one).
Fences 4 For Business is now available for clients needing much larger concurrent activation counts and other business tools.
https://www.stardock.com/corporatesolutions/
Will this new 1 to 1 activation enforcement affect other products I have already purchased?
No, it will not. If you purchase Fences 3 or 4 (or any other product at the time of this writing), it will still have the activation count it had when you purchased it.
If I have activated on a PC that I no longer have access to, how do I free up the license?
Please see:
https://forums.stardock.com/486311/accounts-and-activation-support-faq#deactivateproduct
How will this affect Steam purchases once Fences 4 is available there?
Until Fences 4 is available on Steam, there is not an upgrade path for Steam Fences 3 purchase to obtain Fences 4 at a discount. We will have more information on upgrade options once Fences 4 is available on Steam.